Delete unnecessary code in SHM allocate / free.
We allocate / free SHM regions only when node_comm exists, which means there are more than one processes on the same node. When node_comm is NULL (only self process is on that node), we call default allocate / free functions in CH3. (Please refer to commit f02eed5b ) Here we delete unnecessary code dealing with node_comm being NULL in SHM allocate / free functions. Signed-off-by: Pavan Balaji <firstname.lastname@example.org>